Snippet – Please help to understand

I am trying to understand what Snippet is.. Some sources said it is a content that will be displayed in the search engine results.. But these results are formed from the description tag.. For what do we create Snippet if it will be taken from the description tag?

What kind of format do Snippet files have?

Where to upload this file?

 

i also don't know more about Snippet any one have good idea ?

 

Snippet is the content of the website returned as search engine results page. A special Meta Description Tag can be used for specifying your desired short description. The description returned by the search engine is usually a combination of the Meta Description Tag and extracts from the text on the page. The attractiveness of a snippet description is very important to win visitors over and persuade them to click on your link to visit your website.

 

Jeff Collision, thank you for your answer.. you clarify how it works

 

Atleast it help to undersatand what is snippet is actual about.
thanks